Use pipenv for python dependency management

changelog/fragments/use-pipenv-for-python-package-installation.yaml

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+entries:
+  - description: >
+      For Ansible-based operators, Python package installation in the Docker
+      image is delegated to a pipenv managed Pipfile and Pipfile.lock, pinning
+      both the main installed packages and their subdependencies. This prevents
+      installing conflicting (sub)dependencies
+
+    kind: change
+
+    breaking: false
+
+  - description: >
+      For Ansible-based operators, the Python following packages were updated:
+      `openshift` was updated to 0.11.2, `ansible-runner` was updated to 1.4.6.
+
+    kind: change
+
+    breaking: false

images/ansible-operator/Pipfile

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+[[source]]
+url = "https://pypi.org/simple"
+verify_ssl = true
+name = "pypi"
+
+[packages]
+ansible-runner = "==1.4.6"
+ansible-runner-http = "==1.0.0"
+ipaddress = "==1.0.23"
+openshift = "==0.11.2"
+ansible = "==2.9.15"
+jmespath = "==0.10.0"
+
+[dev-packages]
+
+[requires]
+python_version = "3.8"